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Sony Service Company
National Technical Services Service Bulletin
A Division of Sony Electronics Inc.
Park Ridge, New Jersey 07656 TV Products
Model: KP-53HS10, KP-61HS10 No. 504
Subject: Audio Dropout/Distortion Under Low AC Date: September 21, 2000
Conditions.
Symptom:
(2511) Audio mutes or distorts under low AC conditions
Solution: If the customer should complain of audio dropout please make the following circuit
changes on the "K" Board.
1. Change the value of capacitor C2054 to 10uf/ 50v.
Note: It is possible to use a 16v, or 25v rated capacitor as a substitute.
2. Mount a 10uf/50-volt capacitor from the anode side of diode D2023 with the
negative side of the cap to ground.
Ref Description Former Description New Part Number
C2054 470UF/16v 10UF/50V 1-126-964-11
C1 Not Mounted 10UF/50V 1-126-964-11
Reference: SBR9918 PRINTED IN USA
TV Products Service Bulletin No. 504
Q2017
K Board
Positive
side of the
Change C2054 cap
to 10UF
Mount a 10uf/50V capacitor with
the positive side of the cap to the
anode side of D2023.
TV Products Service Bulletin No. 504
C2054 Replace with 10uf/50V
Add C1
10uf/50V (positive side
of capacitor to anode
side of D2023).
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